When you help someone, and you go back to tell the fellow, "Remember how I helped you that other time," you are indirectly trying to make them your prisoner.
You must note that it is God who ordained for you to perform that good deed for that fellow. He already planned on doing it, you were only privileged to be the one He chose to use. -Ephesians 2:10
God does not share His glory with any man. -Isaiah 42:8. Don't try to contend with God over the good things He is doing in the lives of others through you.
“Don't become a pain in somebody's neck or a source of remembering their shame just because you once helped them.”
Memorise: Therefore when thou doest thine alms, do not sound a trumpet before thee, as the hypocrites do in the synagogues and in the streets, that they may have glory of me. Verily I say unto you, They have their reward. -Matthew 6:3 
